Finding the Fourth Proportional to 1,069.69, 1,475.94 and 775.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.69 : 1,475.94 = 775.39 : x
2. Step 2: Convert to fraction form
   1,069.69/1,475.94 = 775.39/x
3. Step 3: Cross multiply
   1,069.69x = 1,475.94 × 775.39
4. Step 4: Simplify right side
   1,069.69x = 1,144,429.12
5. Step 5: Solve for x
   x = 1,144,429.12/1,069.69
6. Step 6: Final answer
   x = 1,069.87